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Heterogeneous Ice Nucleation in the Tropical Tropopause Layer

Jensen, E. and Kärcher, Bernd and Ueyama, Rei and Pfister, L. and Bui, T.P. and Diskin, Glenn and Gangi, Joshua and Woods, Sarah and Lawson, Paul and Froyd, Karl and Murphy, Dan (2018) Heterogeneous Ice Nucleation in the Tropical Tropopause Layer. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, pp. 1-18. Wiley. DOI: 10.1029/2018JD028949 ISSN 2169-897X

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JD028949

Abstract

Recent laboratoryexperiments have advanced our understanding of heterogeneous ice nucleation at low temperatures. We use these laboratory results, along with field measurements of aerosol composition, to constrain a parameterization of heterogeneous nucleation rate dependence on temperature and supersaturation. We apply this nucleation parameterization in detailed simulations of transport and cloud formation in the Tropical Tropopause Layer (TTL, ≃14–18 km) constrained by high-altitude aircraft measurements of TTL cirrus microphysical properties and supersaturation. The model results indicate that if the abundant TTL organic-containing aerosols were effective glassy ice nuclei (IN), as indicated by laboratory experiments with simple sugars/acids, then heterogeneous nucleation would prevent the occurrences of large ice concentrations and large ice supersaturations, both of which are clearly indicated by the in situ observations. If glassy organic aerosols are relatively poor IN, as indicated by laboratory experiments with more atmospherically relevant secondary organic aerosol-like composition, then the simulated ice concentrations and supersaturations are in reasonable agreement with the observations. C

Item URL in elib:https://elib.dlr.de/123007/
Document Type:Article
Title:Heterogeneous Ice Nucleation in the Tropical Tropopause Layer
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jensen, E.NASA Ames Research Center, Moffet Field, CA, USAUNSPECIFIED
Kärcher, BerndDLR, IPAhttps://orcid.org/0000-0003-0278-4980
Ueyama, ReiNASA Ames Research Center, Moffet Field, CA, USAUNSPECIFIED
Pfister, L.NASA Ames Research Center, Moffet Field, CA, USAUNSPECIFIED
Bui, T.P.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIED
Diskin, GlennNASA Langley Research Center, Hampton, VA, USAUNSPECIFIED
Gangi, JoshuaNASA Langley Research Center, Hampton, VA, USAUNSPECIFIED
Woods, SarahSPEC, Boulder, USAUNSPECIFIED
Lawson, PaulSPEC, Boulder, USAUNSPECIFIED
Froyd, KarlNOAA, Boulder, USAUNSPECIFIED
Murphy, DanNOAA CSD/ESRL, USAUNSPECIFIED
Date:2018
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
DOI :10.1029/2018JD028949
Page Range:pp. 1-18
Publisher:Wiley
ISSN:2169-897X
Status:Published
Keywords:cirrus, ice nuclei, Tropopause, simulations
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Kärcher, Prof. Bernd
Deposited On:12 Nov 2018 08:53
Last Modified:12 Nov 2018 08:53

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